Width is measured across the chest below the sleeves from seam to seam. Height is measured from the bottom of the shirt to the highest point on the shoulder (where the seam meets the neck).

Please note that each product has its own specific sizing chart.
SizeWidth (inches)Height (inches)
Adult Small - Navy Blue1827.5
Adult Medium - Navy Blue2028.5
Adult Large - Navy Blue21.529.5
Adult XL - Navy Blue2430
Adult 2XL - Navy Blue2631